$1-$ How do caches help improve performance? Why do systems not use more

or larger caches if they are so useful?

$2-$ Discuss the advantages and disadvantages of associating with remote file

systems $($stored on file servers$)$ a set of failure semantics different from

those associated with local file systems

$3-$ Why must the bit map for file allocation be kept on mass storage, rather

than in main memory?